# STC SA3122SO

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Honeywell International Inc., United States
- Description: Installation of the CAS-81 TCAS II system and dual TRA-67 Mode S transponders.
- Status date: February 24, 2000
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A20WE](https://openairdocs.org/tcds/A20WE)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/73F5609B6674107D85256CC2000A941C.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA3122SO

## ADs that name it (0)

None.

## Approved models (3)

- The Boeing Company 747-100 Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE))
- The Boeing Company 747-200 Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE))
- The Boeing Company 747SP Series ([TCDS A20WE](https://openairdocs.org/tcds/A20WE))

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